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Old 10-12-2015, 07:54 PM   #1
Scooby Newbie
Member#: 417301
Join Date: Mar 2015
Chapter/Region: NESIC
2015 WRX

Default McMaster Carr Has All of Your Sound Deadening Materials

So I've been looking into sound deadening for my WRX. The rattles have gotten out of control. So I already spent a bunch of money on Dynamat Extreme for the job. But I was wondering what might happen if I were to try and build a solution myself. Naturally I headed off to McMaster to see if I could find materials.

The Research Begins
After reading around on the forums here, I was turned to a seemingly very knowledgeable website called
Sound Deadener Showdown (SDS). There was a plethora of information to absorb (see what I did there) so I got to reading. Here's a summary of what I got out of it.

There are 4 main ways to deaden sound for higher quality ride/music listening experience.

The first way is Constraint Layer Damping (CLD). Don't know what that is? It's okay, neither did I until I started reading up on it. The basics come down to this: Every material will vibrate at a given frequency based on density, thickness, and length. There are ways to calculate this, but we're going into sound engineering so I'll leave it out in the interest of making the information easier to digest. So if I were to tap your door or trunk or deck lid of your car, the sound it would make would be it's resonant frequency. The resonant frequency is also the sound frequency that an object will carry across its surface, making it seem like it is amplifying it. Constraint Layer Damping is designed to eliminate that. Remember how I said an objects resonance is based on density, thickness and length? CLDs are designed to change those numbers, effectively ruining the object's resonant frequency. Sound Deadener Showdown uses what they call "CLD Tiles". They are an adhesive backed material that you stick on panels in strategic locations to supress vibrations caused by resonance. The fellows over at SDS have come up with placing them where "enough CLD Tile™ to cover 25% of the surface distributed over the central 50%-75% of the panel." I'm guessing this is based on testing they've done, and I won't argue with it. A quick lookup shows that McMaster Carr carries this in tape form.

The second method is Airborne Sound Blocking. Sound Blocking merely reflects sound away from surfaces rather than letting it pass through. This has obvious benefits when you want to isolate areas such as the cabin of your car from road noise or natural resonance coming from locations outside of the cabin. SDS attacks this problem with Mass-Loaded Vinyl. A quick lookup shows that McMaster Carr carries this in sheets.

The third method of sound deadening is Sound Absorption. This differs from sound blocking in that it takes sound and transforms it into heat. It does not reflect it away like sound blocking does. SDS does this with melamine foam. Okay this one you actually know of. You may not know it at melamine foam, but rather as the Magic Erasers that you might clean surfaces around the house with. Yea, you can literally use those for sound control. I didn't know that until my research. A quick lookup shows that McMaster Carr carries this in sheets, rods, and pipes.

The final sound deadening technique is Decoupling Rattling Interfaces. This one is pretty self explanatory. You shove something that doesn't rattle between two materials that do. SDS uses Closed Cell Foam (CCF). Specifically, Neoprene/ethylene propylene diene monomer (EDPM) closed cell foam. This foam comparatively has no sound insulation properties. Sound passes right through. It's only good for decoupling two panels that rattle against each other. A quick lookup shows that McMaster Carr carries this in sheets and tape.

After a short analysis, there really aren't many cost savings. Mass Loaded Vinyl is actually cheaper per pound on McMaster Carr even though I did not list it that way in the table below. That is because they sell them in 1/2 and 1" thicknesses. SDS sells them in 0.107" thickness. However the stuff is heavy. SDS's product is 1 lb/ft. Make sure you need the thickness if ordering from McMaster. The main advantage with McMaster Carr products is the various sizes you can get them in. McMaster also has a great delivery service. Most everything I have ever ordered have been next day delivery. Great for projects where you realize you need something in the middle of it.

On the other hand, this speaks volumes to the levels of customer satisfaction Sound Deadening Showdown strives for. They are an excellent value. Their knowledge is top notch and they are constantly backing up claims with testing. None of this is meant to detract business away from them. I just wanted to see if I could find other options. Good on them.

Other useful items on Sound Deadening Showdown found on McMaster Carr

Contact Adhesives for Vinyl Fabrics
Hook and Loop Fasteners
Weatherproof Rubber Tape
Seam Rollers

Other Useful Materials Not on Sound Deadening Showdown Found McMaster Carr
Sound and Vibration Dampers
Sound Absorbers

http://www.sounddeadenershowdown.com/home - Sound Deadening Showdown Home Page
http://www.sounddeadenershowdown.com...tiles%E2%84%A2 - CLD Tiles
http://www.sounddeadenershowdown.com...aded-vinyl-mlv - Mass Loaded Vinyl
http://www.sounddeadenershowdown.com...-melamine-foam - Melamine Foam
http://www.sounddeadenershowdown.com...-cell-foam-ccf - Closed Cell Foam
http://www.mcmaster.com/#6307a21 - Noise Damping Foil Tape, 1" Width x 5 Yards Length
http://www.mcmaster.com/#6307a22/ - Noise Damping Foil Tape, 2" Width x 5 Yards Length
http://www.mcmaster.com/#6307a11/ - Noise Damping Foil Tape, 2" Width x 36 Yards Length
http://www.mcmaster.com/#mass-loaded-vinyl/=zc8pvq - Mass Loaded Vinyl
http://www.mcmaster.com/#melamine-so...rol-insulation - Melamine Sound Control Insulation
http://www.mcmaster.com/#melamine-thermal-insulation/ - Melamine Thermal Insulation
http://www.mcmaster.com/#melamine-foam/ - Melamine Foam
http://www.mcmaster.com/#melamine-foam-sheets/ - Melamine Foam Sheets
http://www.mcmaster.com/#standard-cl...l-foam-sheets/ - Neoprene/EDPM Closed Cell Foam (filter material type to neoprene on left side of the page)
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Last edited by tomferd; 10-13-2015 at 01:09 PM.
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